Guarddog

Guarddog is a
firewall generation/management utility.

Guarddog is aimed at two groups of users, namely novice to
intermediate users who are not experts in TCP/IP networking and
security, and those
users who do not want the hassle of dealing with cryptic shell scripts
and
ipchains/iptables parameters. It allows you simply specify which
protocols should be
allowed and requires no knowledge of port numbers. Generates
scripts for ipchains.

Guarddog 2.6.0

Price
Free to downloadSize1.0MB
License
GNU General Public LicenseDeveloperSimon Edwards

Application protocol based. Unlike other tools, Guarddog
does not
require you to understand the ins and outs of IP packets and ports.
This also reduces the chances of configuration
mistakes being made which are a prime source of security holes.

Lets you maintain and modify the firewall in place.

Hosts/networks can be divided into Zones. Different zones
can have
different security policies for different.

Unlike their Window counterparts, the vast majority of
the Linux applications listed in the section are available to download
without charge (a few of the Linux equivalents are commercial, or
released under a proprietory license).